The following information shows the result of the orbit fit based on Gary Bernstein's method. Most of the information should be self-explanatory. Take special note that while the original Bernstein software works with barycentric coordinates, we convert these results into a heliocentric coordinate system.
# Object: 17SK381
# Created Wed Nov 27 02:10:52 2024
# Orbit generated from Bernstein formalism
# Fitting 11 observations of 11
# Arc: 48.89d
# First observation: 2017/07/30
# Last observation: 2017/09/17
Preliminary a, adot, b, bdot, g, gdot:
0.000000 0.025077 -0.000001 0.005129 0.024897 0.000000
# WARNING MRQMIN stopped after 13 iterations -- oscilliatory solution
# WARNING Fitting with energy constraint
# Chi-squared of fit: 19.48 DOF: 17 RMS: 0.24
# Min/Max residuals: -0.63 0.30
# Exact a, adot, b, bdot, g, gdot:
1.493901E-05 2.244812E-02 2.327274E-06 5.079991E-03 2.416609E-02 -8.334799E-03
# Covariance matrix:
3.1070E-13 1.3093E-10 -7.4753E-15 2.6343E-12 3.7610E-11 4.6139E-09
1.3093E-10 5.7359E-07 -1.5229E-11 2.6469E-09 1.2934E-07 7.4980E-06
-7.4753E-15 -1.5229E-11 2.1603E-13 -1.8477E-12 -3.9060E-12 -3.7527E-10
2.6343E-12 2.6469E-09 -1.8477E-12 1.0842E-10 8.3810E-10 1.2470E-07
3.7610E-11 1.2934E-07 -3.9060E-12 8.3810E-10 3.0086E-08 2.0344E-06
4.6139E-09 7.4980E-06 -3.7527E-10 1.2470E-07 2.0344E-06 2.2635E-04
# lat0 lon0 xBary yBary zBary JD0
0.399625 2.474243 0.828288 0.004154 -0.582442 2457965.011681
# Heliocentric elements and errors
Epoch: 2457960.5000 = 2017/07/26
Mean Anomaly: 303.85762 +/- 54.467
Argument of Peri: 100.20916 +/- 8.473
Long of Asc Node: 359.61331 +/- 0.082
Inclination: 12.88357 +/- 0.532
Eccentricity: 0.36667561 +/- 0.6179
Semi-Major Axis: 45.87757451 +/- 21.9524
Time of Perihelion: 2475661.0753 +/- 11553.7
Perihelion: 29.05538704 +/- 31.5742
Aphelion: 62.69976199 +/- 41.2764
Period (y) 310.7484 +/- 223.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X 41.95574599 +/- 0.2967
Ecliptic Y 0.97931691 +/- 0.0128
Ecliptic Z 0.28875990 +/- 0.0021
Ecliptic XDOT -0.00105254 +/- 0.0017
Ecliptic YDOT 0.00249405 +/- 0.0001
Ecliptic ZDOT 0.00056882 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 41.96816729 +/- 0.2966
Geocenter to KBO 41.38029387 +/- 0.2970
# Hcoef: 8.31
The following table shows the complete astrometric record for 17SK381. The first three columns show the date of observation. The next six columns are RA and DEC. The next column (when provided) is the observed magnitude and filter. The next column is the object name (17SK381) followed by the observatory code and reference code for the source of the astrometry.
2017 07 30.51088 00 08 26.74 +01 21 02.3 24.3r 17SK381 T09 C~85Ja 2017 07 30.53711 00 08 26.68 +01 21 01.9 24.2r 17SK381 T09 C~85Ja 2017 07 30.57126 00 08 26.61 +01 21 01.6 24.3r 17SK381 T09 C~85Ja 2017 07 30.61408 00 08 26.50 +01 21 01.1 24.6r 17SK381 T09 C~85Ja 2017 08 01.43006 00 08 22.19 +01 20 38.8 24.2y 17SK381 T09 C~85Ja 2017 08 01.49991 00 08 22.05 +01 20 39.1 23.5y 17SK381 T09 C~85Ja 2017 08 01.59485 00 08 21.82 +01 20 37.6 24.0y 17SK381 T09 C~85Ja 2017 09 17.31838 00 05 27.48 +01 04 27.4 25.2i 17SK381 T09 C~85Ja 2017 09 17.32106 00 05 27.46 +01 04 27.1 24.4i 17SK381 T09 C~85Ja 2017 09 17.36119 00 05 27.27 +01 04 26.1 24.6i 17SK381 T09 C~85Ja 2017 09 17.40160 00 05 27.09 +01 04 25.2 24.7i 17SK381 T09 C~85Ja
The following table shows the residuals to the orbit fit. The first coumn is the point number. The second column is the time, in years, measured from the first observation. The third and fifth columns are the regularized positions used in the orbit fit. The fourth and sixth columns are the residuals, in arc seconds, for RA and Dec respectively.
1 0.0000 0.00 -0.05 0.00 0.21
2 0.0001 -0.98 -0.06 -0.01 0.10
3 0.0002 -2.07 0.13 0.13 0.11
4 0.0003 -3.78 0.02 0.33 0.14
5 0.0053 -71.95 -0.63 5.56 -0.63
6 0.0054 -73.76 0.30 6.67 0.22
7 0.0057 -77.52 0.30 6.66 -0.15
8 0.1336 -2862.42 0.13 156.15 0.06
9 0.1336 -2862.81 -0.07 155.99 -0.10
10 0.1337 -2865.82 -0.11 156.21 -0.02
11 0.1339 -2868.66 0.05 156.46 0.08
The following table comes from a 10My integration of the orbit of the object. Three columns are shown. The first column is the result of integrating the nominal orbit. The other two columns are based on clones of the nominal orbit that are +/- 3 sigma from the nominal orbit. If all three types agree then the classificiation is deemed secure. The basis for these calculations is described in more detail in AJ, 129, 1117 (2005). Any use made of these calculations should refer to and credit this publication and the Deep Ecliptic Survey Team.